UBUNTU-CVE-2024-42131
In the Linux kernel, the following vulnerability has been resolved: mm: avoid overflows in dirty throttling logic The dirty throttling logic is interspersed with assumptions that dirty limits in PAGE_SIZE units fit into 32-bit (so that various multiplications fit into 64-bits). If limits end up being larger, we will hit overflows, possible divisions by 0 etc. Fix these problems by never allowing so large dirty limits as they have dubious practical value anyway. For dirty_bytes / dirty_background_bytes interfaces we can just refuse to set so large limits. For dirty_ratio / dirty_background_ratio it isn't so simple as the dirty limit is computed from the amount of available memory which can change due to memory hotplug etc. So when converting dirty limits from ratios to numbers of pages, we just don't allow the result to exceed UINT_MAX. This is root-only triggerable problem which occurs when the operator sets dirty limits to >16 TB.
02 / AFFECTED SOFTWARE
Affected packages
11 explicit affected versions
35 explicit affected versions
49 explicit affected versions
50 explicit affected versions
6 explicit affected versions
12 explicit affected versions
19 explicit affected versions
6 explicit affected versions
58 explicit affected versions
12 explicit affected versions
44 explicit affected versions
68 explicit affected versions
54 explicit affected versions
44 explicit affected versions
10 explicit affected versions
6 explicit affected versions
12 explicit affected versions
51 explicit affected versions
191 explicit affected versions
7 explicit affected versions
50 explicit affected versions
7 explicit affected versions
95 explicit affected versions
13 explicit affected versions
85 explicit affected versions
9 explicit affected versions
35 explicit affected versions
11 explicit affected versions
16 explicit affected versions
18 explicit affected versions
12 explicit affected versions
118 explicit affected versions
37 explicit affected versions
12 explicit affected versions
97 explicit affected versions
13 explicit affected versions
4 explicit affected versions
121 explicit affected versions
23 explicit affected versions
16 explicit affected versions
1 explicit affected versions
21 explicit affected versions
16 explicit affected versions
10 explicit affected versions
52 explicit affected versions
14 explicit affected versions
7 explicit affected versions
12 explicit affected versions
111 explicit affected versions
42 explicit affected versions
12 explicit affected versions
14 explicit affected versions
7 explicit affected versions
85 explicit affected versions
12 explicit affected versions
100 explicit affected versions
108 explicit affected versions
12 explicit affected versions
7 explicit affected versions
96 explicit affected versions
120 explicit affected versions
11 explicit affected versions
7 explicit affected versions
1 explicit affected versions
10 explicit affected versions
37 explicit affected versions
13 explicit affected versions
5 explicit affected versions
10 explicit affected versions
31 explicit affected versions
1 explicit affected versions
35 explicit affected versions
26 explicit affected versions
13 explicit affected versions
144 explicit affected versions
6 explicit affected versions
1 explicit affected versions
29 explicit affected versions
88 explicit affected versions
13 explicit affected versions
55 explicit affected versions
6 explicit affected versions
7 explicit affected versions
1 explicit affected versions
83 explicit affected versions
53 explicit affected versions
100 explicit affected versions
15 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
1 explicit affected versions
188 explicit affected versions
11 explicit affected versions
12 explicit affected versions
7 explicit affected versions
12 explicit affected versions
98 explicit affected versions
138 explicit affected versions
2 explicit affected versions
42 explicit affected versions
36 explicit affected versions
132 explicit affected versions
52 explicit affected versions
165 explicit affected versions
154 explicit affected versions
10 explicit affected versions
26 explicit affected versions
14 explicit affected versions
34 explicit affected versions
1 explicit affected versions
5 explicit affected versions
15 explicit affected versions
13 explicit affected versions
14 explicit affected versions
139 explicit affected versions
58 explicit affected versions
16 explicit affected versions
55 explicit affected versions
15 explicit affected versions
43 explicit affected versions
116 explicit affected versions
3 explicit affected versions
93 explicit affected versions
1 explicit affected versions
2 explicit affected versions
65 explicit affected versions
51 explicit affected versions
92 explicit affected versions
12 explicit affected versions
12 explicit affected versions
41 explicit affected versions
27 explicit affected versions
27 explicit affected versions
1 explicit affected versions
1 explicit affected versions
98 explicit affected versions
8 explicit affected versions
8 explicit affected versions
16 explicit affected versions
5 explicit affected versions
8 explicit affected versions
1 explicit affected versions
10 explicit affected versions
11 explicit affected versions
13 explicit affected versions
87 explicit affected versions
13 explicit affected versions
52 explicit affected versions
7 explicit affected versions
140 explicit affected versions
94 explicit affected versions
46 explicit affected versions
10 explicit affected versions
13 explicit affected versions
12 explicit affected versions
87 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
41 explicit affected versions
37 explicit affected versions
15 explicit affected versions
14 explicit affected versions
38 explicit affected versions
167 explicit affected versions
44 explicit affected versions
9 explicit affected versions
44 explicit affected versions
11 explicit affected versions
6 explicit affected versions
1 explicit affected versions
52 explicit affected versions
7 explicit affected versions
25 explicit affected versions
97 explicit affected versions
59 explicit affected versions
121 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
50 explicit affected versions
13 explicit affected versions
43 explicit affected versions
53 explicit affected versions
10 explicit affected versions
8 explicit affected versions
10 explicit affected versions
14 explicit affected versions
88 explicit affected versions
4 explicit affected versions
77 explicit affected versions
11 explicit affected versions
1 explicit affected versions
69 explicit affected versions
8 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: mm: avoid overflows in dirty throttling logic The dirty throttling logic is interspersed with assumptions that dirty limits in PAGE_SIZE units fit into 32-bit (so that various multiplications fit into 64-bits). If limits end up being larger, we will hit overflows, possible divisions by 0 etc. Fix these problems by never allowing so large dirty limits as they have dubious practical value anyway. For dirty_bytes / dirty_background_bytes interfaces we can just refuse to set so large limits. For dirty_ratio / dirty_background_ratio it isn't so simple as the dirty limit is computed from the amount of available memory which can change due to memory hotplug etc. So when converting dirty limits from ratios to numbers of pages, we just don't allow the result to exceed UINT_MAX. This is root-only triggerable problem which occurs when the operator sets dirty limits to >16 TB.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/385d838df280eba6c8680f9777bfa0d0bfe7e8b2
- https://git.kernel.org/stable/c/385d838df280eba6c8680f9777bfa0d0bfe7e8b2
- https://git.kernel.org/stable/c/7a49389771ae7666f4dc3426e2a4594bf23ae290
- https://git.kernel.org/stable/c/8e0b5e7f2895eccef5c2a0018b589266f90c4805
- https://git.kernel.org/stable/c/a25e8536184516b55ef89ab91dd2eea429de28d2
- https://git.kernel.org/stable/c/bd16a7ee339aef3ee4c90cb23902afb6af379ea0
- https://git.kernel.org/stable/c/c83ed422c24f0d4b264f89291d4fabe285f80dbc
- https://ubuntu.com/security/CVE-2024-42131
- https://ubuntu.com/security/notices/USN-7007-1
- https://ubuntu.com/security/notices/USN-7007-2
- https://ubuntu.com/security/notices/USN-7007-3
- https://ubuntu.com/security/notices/USN-7009-1
- https://ubuntu.com/security/notices/USN-7009-2
- https://ubuntu.com/security/notices/USN-7019-1
- https://ubuntu.com/security/notices/USN-7088-1
- https://ubuntu.com/security/notices/USN-7088-2
- https://ubuntu.com/security/notices/USN-7088-3
- https://ubuntu.com/security/notices/USN-7088-4
- https://ubuntu.com/security/notices/USN-7088-5
- https://ubuntu.com/security/notices/USN-7089-1
- https://ubuntu.com/security/notices/USN-7089-2
- https://ubuntu.com/security/notices/USN-7089-3
- https://ubuntu.com/security/notices/USN-7089-4
- https://ubuntu.com/security/notices/USN-7089-5
- https://ubuntu.com/security/notices/USN-7089-6
- https://ubuntu.com/security/notices/USN-7089-7
- https://ubuntu.com/security/notices/USN-7090-1
- https://ubuntu.com/security/notices/USN-7095-1
- https://ubuntu.com/security/notices/USN-7119-1
- https://ubuntu.com/security/notices/USN-7156-1
- https://www.cve.org/CVERecord?id=CVE-2024-42131